Valve.



T. DOBSON.

VALVE.

APPLICATlON FILED DEC. H. 1916;

1 ,27 1 ,446. Patented July 2, 1918.

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ITED STATES PATENT orn on TOM DOBSON, OF PAWTUCKET, BHODE ISLAND.

IvALvE.

Specification of Letters Patent. Patented July 2, 1918.

Application filed December 11, 1 916. Serial No. 136,228.

red in the desired proportion before being discharged and is adapted more particularly for controlling the spray for shower bath purposes.

The'invention has for its object to pro- .vide such a valve with a mixing chamber .having a pair of inlet valves and a pair of cams adapted to open these valves successively to admit the cold water in advance of the hot water to prevent the possibility of scalding the batherl A3 furtheriobject of. the invention is to provide separate and independent fittings carryingthe valve seats for theport openings into the mixing chamber, which feature has a number of advantages among others being first, the reduction in the cost of construction; and second, the fitting may be readily replaced if its 'seatbecomes worn or injured and that without the necessity of replacing the whole chamber, to remedy this difficulty. i

A further object of the invention is the provision of cams adapted to act upon the valves to movethem to open position only,

said valves being moved toward their seats independent of the action of thesecams, by

which construction eachis adapted toautomatically compensatefor any wear upon it and its seat.

A further object of the invention is the provision of a discharge outlet control valve, which is adapted to stop a possible drip from the discharge pipe in case of a leak in either of the inletvalves.

With these and other objects in view, the invention consists of certain novel features of construction, as will be more fully described, and particularly pointed out in the appended claims.

In the accompanying drawings: Figurel isa front elevation of my improved valve showing the'same as connected to the piping; also showing the controlling handle. i 1 Fig; 2- is a central sectional side elevationthrough this valve showing the operating mechanism. i

Fig. 3 is an end view of the mixing chamber with the front plate removed.

Fig. 4-- is a diagrammatic view illustrating the action of the cams upon the valves showing the cold water valve 3 as opened first by the movement of the operating handle.

F g. 5- shows the cams as moved into position to open the hot water valve to its fullest extent {also showing the relative posi- .tion of the cold water controlling cam.

Fig, 6- shows the position ofthe cams in which both are'shown as acting on their respective valves to open them and admit both hot andcold water to be mixed in the chamber before being discharged therefrom. I F g. 7 showsthe discharge valve in open posltlon and the shape of its operating cam.

, Referring to the drawings, 10 designates the mixing chamber of cup-shape, and which maybe formed of any suitable material and of desired size,the outer end of this chamber being provided with a closing cap or plate 11 secured in position thereon by screws 12; This plate is provided with a packing gland 13 through which the camshaft 14: passes.

Thismixing chamber is provided with three valve openings for theadmission and discharge of the water. Each of these openings is provided with fittings which are formed separate and independent of the casing and secured thereto.

-The pair of fittings 15 and 16 are for hot I and cold water respectively, each being threaded at one end into the wall of the chamber 10 while its opposite endisinternallythreadeol for the reception of the respective pipes 17 and 18. Each ofthese fittings is shown as being provided with a tapering hole 19 and 20 into each of which is fitted correspondingly tapered plugshaped valves 21 and 22 held normally to their seats by the pressure within pipes 17 and 18. The inner ends of these valves are arranged to project into the chamber, to be engaged respectively by their controlling cams 23 and 24. These cams are mounted on the cam shaft 14, the cold water controlling cam being set in advance of the hot water controlling cam, whereby a movement of the operating handle 25 from its closed toward its open position causes this cam 23 to first engage its valve 19 and so first admit a supply of cold water, and a further movement of this handle in the same direc tion causes the cam 24 to engage its valve 22 thereby admitting a portion of hot along with the cold, which position is best illustrated by Fig. 6. A still further movement of this handle in the same direction into the position illustrated in Fig. 5 permits the cold water valve to close partially and the hot to be wide open.

I have also found it to be of advantage to provide a valve 29 for the discharge outlet, which outlet is formed by a nipple 26 threaded on its outer surface through the wall of the chamber and threaded at its outer end for the reception of the discharge pipe 27, the inner end of this nipple extending through the chamber wall and forms a seat 87 against which the-flange 28 of the valve 29 is pressed by action of the cam 30, the spring 31 acting upon this valve causes it to follow the cam to open position.

This discharge controllin cam is also mounted on the shaft 14 and is set so as to permit the closing of the discharge valve when both of the inlet valves are closed,

and to open the same quickly by the first movement of the handle 25 toward the open position before either of the inlet valves are opened.

The inner end of this cam shaft 1% is provided with a bearing in the boss 31 and the opgrating handle 25 is connected to its outer en This handle is preferably provided with a pointer or finger 32 which moves over the indicating plate 33 to show the required position of the handle in order to obtain the desired mixture of water, the stop pin 32 limiting its motion in the closed direction while the stop pin 35 limits its motion in the opposite direction.

The whole device may be supported in any suitable way, but I prefer to connect the same directly to the piping and to attach the pipes to the wall of the building.

The provision of separate fittings for the valves has a number of advantages from a practical standpoint among others being first, that thesefittings carry the seat for the valves, which work therein, and these seats may be formed much more accurately removed and replaced by a fresh one, without necessitating the disconnecting and repla-olng of an entire valve body.

It will also be noted that the discharge valve opens inwardly whereby a pressure in the chamber caused by a leak in either of the inlet valves, would have a tendency to force the outlet valve to its seat, and make the same tight and in this case if the spring31 was not powerful enough to open the valve against this pressure it could easily be relieved from the chamber by opening the pet cook 36.

Another essential advantage of my particular construction of mixing valve is that both of the inlet valves are entirely of metal and are formed tapering thereby obviating the necessity of using packing in order to keep them tight, which construction is of particular advantage especially in hot water control valves, as packing in such valves is continually getting out of order and leakmg.

Having thus described one illustrative embodiment of my invention, I desire it to be understood that the details of construction may be varied without departing from the spirit of my invention, the scope of which is defined by the appended claims.

I claim:

1. A valve of the character described comprising a mixing chamber having tapered inlet ports and an outlet port, said inlet ports forming valve seats, elongated conical valves cooperating with said inlet ports, and having their smaller ends extending into said chamber, whereby the larger ends are exposed to the pressure of fluid flowing toward said chamber to hold the valves nor mally to their seats, said valves being guided solely by the tapered walls of the inlet ports, and a cam shaft within said chamber positioned to unseat said valves when the shaft is rotated in one direction.

2. A valve of the character described comprising a mixin chamber provided with inlet openings and an outlet opening, removable fittings communicating with said inlet openings and provided with elongated conical valve seats, supply pipes attached to said fittings, elongated conical valves cooperatin with said seats and having their smaller enlls extending into the chamber, whereby said valves are held normally seated by pressure of infiowing fluid acting against their larger ends, said valves being guided solely by said seats, and a cam shaft within said chamber positioned to unseat said valves when the shaft is rotated in one direction.

3. A valve of the character described comprising a mixing chamber provided with tapered inlet openings forming elongated conical valve seats, said chamber also having an outlet opening, elongated conical valves guided solely by said valve seats and havin their smaller ends extending into said 0 amber, whereby said valves are nort mally held seated by pressure of inflowing fluid acting against their larger ends, a valve 10 for the outlet opening, a spring acting to for opening or closing the outlet valve While both inlet valves are closed.

In testimony whereof Iaflix my signature 15 in presence of a witness.

TOM DOBSON.

' Witness HOWARD E. BARLOW.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, walhington, D. 0. 

